interrupt problem

colas · ‎2004-07-14

Posted on July 14, 2004 at 13:12

interrupt problem

colas · ‎2004-05-26

Posted on May 26, 2004 at 12:42

I use STPC consumer II on a PC104. I have got DOS6.22 and I work with TURBOC. I want to use IRQ12 as a hardware interrupt. A square signal is connect on the ISA IRQ12 Pin.

My C program run ok on an old STPC Client but not on STPC consumer II. The program build but when I run it, the program doesn't jump on the interrupt function.

#include

void interrupt int_timer(void);

void interrupt (*old_int12)(void);

#define irq12 0x74 // Adresse de irq12 : Timer

unsigned char compteur = 1;

void interrupt int_timer(void)

{

compteur++;

outportb(0x20,0x20); //PIC1 EOI

outportb(0xA0,0x20); //PIC2 EOI

}

void main(void)

{

disable();

old_int12 = getvect(irq12);

setvect(irq12,int_timer);

outportb(0x20+1,inportb(0x20+1) & ~0x04);

outportb(0xA0+1,inportb(0xA0+1) & ~0x10);

enable();

getch();

printf(''compteur : %i'', compteur);

setvect(irq12,old_int12); // IRQ12 ==> Timer

}

if you met this problem, would you help me ?

marios · ‎2004-07-14

Posted on July 14, 2004 at 13:12

I guess you've found the bug since the time you posted this. Have you tried to make the interrupt routine output an I/O byte somewhere, like a POST card, just to find if the program enters the interrupt routine?

Felix